What does an MRC-SS below 48 indicate?

What does an MRC-SS below 48 indicate?

• A. Normal strength
• B. Delirium
• C. ICU-acquired weakness (ICUAW)
• D. Acute pain

Answer: (C)

The key idea is using the MRC sum score to detect generalized muscle weakness in critically ill patients. This test assesses six muscle groups on both sides, each scored from 0 to 5, for a total possible score of 60. A total below 48 indicates ICU-acquired weakness, meaning significant neuromuscular weakness developed during critical illness, often related to prolonged ICU stay or ventilation. This finding helps explain reduced strength and guides rehabilitation planning. Normal strength would yield a score near 60. Delirium is a cognitive disturbance and isn’t measured by muscle strength testing, while acute pain might affect performance but does not define the neuromuscular weakness indicated by a low MRC sum score.

The key idea is using the MRC sum score to detect generalized muscle weakness in critically ill patients. This test assesses six muscle groups on both sides, each scored from 0 to 5, for a total possible score of 60. A total below 48 indicates ICU-acquired weakness, meaning significant neuromuscular weakness developed during critical illness, often related to prolonged ICU stay or ventilation. This finding helps explain reduced strength and guides rehabilitation planning. Normal strength would yield a score near 60. Delirium is a cognitive disturbance and isn’t measured by muscle strength testing, while acute pain might affect performance but does not define the neuromuscular weakness indicated by a low MRC sum score.